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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2782fa3d135211b34398e98f8a4ae1c5889f18eefe9ff1a174040e9923abf8ce' 
  AND token = 'HVcAhFMsxzdHVhsLK2HKstJwqe+9lLWLKTGHe+UjL48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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