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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dd866b30fb8915960f17f65c6aae62a56b54d8e62553b0524656dcd0534528b' 
  AND token = 'oZaqTwjzmvks1/LUHs8te6SAERwuRe+yd9PideR8AW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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