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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '689a36d73844d8fc556b7e6197e2f3310594657321194d1af2c5a08ccc9993ee' 
  AND token = 'sdsq2nyZT8ERz4NJuobtL0SLrn0gdq3XbfPbX8+5UyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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