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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a46c8f9035d7e48b173305e8a5040f4f5b8d4483c09da39f9fe2c82e3be5bbf' 
  AND token = '6QaIADrkYJwTcGnAO0GzFKsvLcKU15Gz62tTeE1dkTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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