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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd2e1af48943dc74156bfdc97d897cba6558c0ac8a19b4f41e3bcea77a4022a2' 
  AND token = '16KVZwEZ2eCkRs3UXQYpoSnCb5kwH0MNOYE0VsdmW3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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