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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13b98394fc637f1dafdcb88e1643b5fabedeb4cd24a647ccd718e10ac29532c1' 
  AND token = 'Gm0BIA6b2N9zfi2TPta6LV3V24XrHQ/UZ/yQDL75u9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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