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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfa7b8f3744cba215550edeb23660bd1c2fa11bda15b1b0085996da47f26f37a' 
  AND token = 'IIoPWR/Lcgktmu8wkr5++EVyPhVEB5J8acRyIf6U3M0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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