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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eae1a29099d56f83014953134891056545c6d9993dfdaed1de36355d6219e0a9' 
  AND token = 'gDF/SU4uEfv6V9lkVd1JOp4HsawOsh7JicC+ngl1w18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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