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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b8dc6628f192d611ac1f789cdc520d8796aae514a2c7979723057c2bad279df' 
  AND token = 'qJjX66zpBIVLwnklE2tVt/q7XjVDj+EjOMqYVNHarj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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