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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '037d12f9625c577137591572b3b5fee84c7474fe8a3e62f8818787f1f0a43029' 
  AND token = '/v7UEXOpNCCLu0H/M39nzKf0PJfU3amtnCBgLPliK5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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