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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ea5813d6f5c19175c3916588e406d1e24a5ac859acf82f27031c8bc2a011c04' 
  AND token = 'oeZUth5nvYuUoqQFtgLUX3O5acZR7jQEJC79lK5DBsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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