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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c9ef0690396a4084eab4a644a6252e0a73b4081dc6d78a9de92ef8279d87a0c' 
  AND token = 'EW1BzLbPFEpGBS5qpDkD0etcT4o1WohWk6oW6oM7RUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}