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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '596473e9bca3d4b6c224f174aa4041e996d969f4a6d199bb94618baa4e12fb1a' 
  AND token = 'QppGX+d6MxLs7l5lBhB+Gi9OlSDSmYHuMqDfvTxMMKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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