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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd19e7c2fc3b066b0470efba7ad9ea44494f30bb696b055c22e61f81f10851fc1' 
  AND token = '8EA3Y1w+/QYculsL5pUN9t3azUJ9CSnJjXy/OmgAT+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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