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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '140cbd66a2bd0e66ea39b03a3d050f175267f26ea9e8872e1a328035e2e31a2c' 
  AND token = 'OOfmXq2vkh6iVIsTRZdfHN0U5cssVfZQtZlJRFhkl2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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