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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8377ce1804ff43a0ba02ca27e1458d6aa07b61cf206b0a03fff733f9279caf1d' 
  AND token = 'C+4RzNjw36mBS5Ibgzua0cmIzd4+yoC2siEF5XZ297k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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