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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fee0c5d73439aa320a2ad1b632c5b76b309d61002a7ef7ec807d502844bec864' 
  AND token = 'yb5qvD23dHI6j3WR41ghOaDZ9PNCrxfDOXJbnnLfnEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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