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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a242c344968a01a5c92628e1eb43b781d2dd065c79ebcc86fc1d7720046e686e' 
  AND token = '6pRgh9uOpp2Bw0HbU0CT9qCR5sVGNdEGdcLGZONLDhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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