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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84402fee659c1bc0189316328df7914eda0e170c61f5e07b8ed6597dc48c35b5' 
  AND token = '8clHWdbCPQnbIDBsplG3y0sfdzNSFjVyM30XspNwKxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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