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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cb5e8434e1848e3954e4b6cae3e573f6a5ed08502f5dc7f1296b390294b8470' 
  AND token = 'xvtlHQcxeJffWXaGaCL44w9hRWAOMaX1uZ8T2K7+J54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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