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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff14b8398ac8a700ddc8c380d3147aad36003752f335b99dd1bbb4bec7a09456' 
  AND token = '87L59g1np+tsdeqUuNE+3gAAArgEksgI0Zgsn1ijan4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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