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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cff0dda0be18895d15af40c2b490d709ce5c357727bce86cfa2cb85265fba685' 
  AND token = 'Tr8Yznkjz1DpmUMjZOPGEP/UEcLH3aHaUS/+q0mJGSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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