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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d1ba038a68d674aa9d6551bd1ac51743b94debfab2df6c49bca43e07661943d' 
  AND token = 'XF57CwmQwkWE+SnEpen0UjLOvFUPnfS6dJtMie+cn+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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