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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26b832c8193f07e004fd7c3ef3b766c9b4d6b176ef2342684da62cf1cd462ed1' 
  AND token = 'CdMUcKpdZytKryIiRHPz+gm8SePtvJl967b+xj9eTL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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