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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2f4a35396e94a4ef1fb3b56059125b711570a77524c7658d6f54676b64f832c' 
  AND token = '8URPrvoinDhwoTPAOc3hXb2wSiu7ztzutrxN7EbxgNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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