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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ce2e53f6fe2145a957fa3f9e72c0ce58fc94aa7d1f02968b74858cbaba809dc' 
  AND token = 'wPxud/Wmdnh5vlQj+Lpne2u9mx3MuzakoVL7F5sPGU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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