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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbba4a6b01fd32a29054c3822c37c3bba891a435542179bcd9b4ac5cfb5d8d5d' 
  AND token = '8DDVNWHSK2ZK/50lZnKwIN06UhE9Nr+QT1YhleJ9/IM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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