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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '225ef168d03dfba9807d80d9c8793b9fb063a7dcaf2044dfcd04cb50b3b94e1f' 
  AND token = 'Xhm07Mnc3qNiU5qFJ9pgngUPrEx2LyTIqfBWv1AHfFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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