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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c2a7e0daf4ce6c4f30ccdb5162a31a2cf18c088e48bfa795c45a9b8fb4faf67' 
  AND token = 'xi57USI3nqFTyu1hoA2A9leA0cPahPblS9jSu5QNHvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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