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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57baab6491b6ece258dfc3aee194e831e2e0490efdb25e6eb1eabd77200971b2' 
  AND token = 'xvjQ961MOM/+LfTs2GK1E1N1TWIu1JHkIg1KlbRCA+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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