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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f96609f1766de79fa487735078d8928af6e6da6bcb6fd62a746dc531f469fd3' 
  AND token = 'lW02tVHAh5G56o6Eg76yF8Fd6EyXIinmMOiLhYa1OCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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