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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76f614705cb84220dda3b4dc59d2201ad8eb2ca80c610a39c6529bcca193c52e' 
  AND token = '5aLUAsre1tzWgq/mvNO3SRJoPvFdIzbjgbModu+vo8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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