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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9a1907f146a41fab81b56d6835ddb831060769c2192436bf4547fc39a8d7c87' 
  AND token = '7dEzE4CUr4J3yltG/YJ5DnpYjdio00uM6fsfm4ov02c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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