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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fb676c443b3506a5bdceb779d9d0d8b7a49347199f1bc50c4d7f9cde78a0b66' 
  AND token = 'db93FFqPgwmpUzmiW/0l/4l5TFnQrahqx5j4tOD30lI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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