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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bafd4e5cb7726a922919e928adbeadbd9a4c08aec94ca0a113dbe9eff9e167ad' 
  AND token = 'YNj4lFBucaAp1/Bgg2wxBdqCfcRORyYrVN/yo7CxpHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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