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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c046a56370453ad3dd5036c3aa8efde5c19b35b2543a439382cc870b8149cce7' 
  AND token = 'CgBIKTRv0ZSpm3tzoxaIo/slxDczWzHk6wIPt0R5EsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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