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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30d172ab9e48d27d5ebb6226aa0cf4f3b652b860578f357de15b151cafa9dbb0' 
  AND token = 'kXW2Uj2LBexsXIkGUIZa+yRYKcvhzA262dErfuBUpx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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