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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfc95c647237cf5f6a1367f6e72d706ef799b79000b3a7603ca27aa2998aac38' 
  AND token = 'Fp5w6MiPyjhesfKmNkVz3pFFcwFLlPTtYbeYdfQ9Cb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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