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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0179de620b2cef1d3c586783c658278779c8d6de93eb03d18506fe7787a3238' 
  AND token = 'kh7x03NwSh0ezLIfKGtYoYRIfIxyHzo28dXKr0ZuOxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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