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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0537bf94e3b1a14314c9e1afe6f74f0767f4fb4e1d0262c049f1ad27db3ac13' 
  AND token = 'eCEH3Al5jQGFOd5AZA7Ta5HN4Yp6IVyMWmvssqbh0y8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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