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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '186222b2dc5cf0bd2b6945eb2bb9ce4b9f62fbf8f7c1f328f08368630c809fae' 
  AND token = 'YfEN7BaesDZglFucWhyL1Y2pURbZhn4fCmr5oR+gt+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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