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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c51c70826af6ff0fe9c030de94b6b4015c0c7a5a01151415c3e10ee0e9a12305' 
  AND token = 'Kvj8Kr/9XktBaQ+2vUg6yX/N7J4baLCd6b0xn3e+GeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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