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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e903f8a6de2d9a4eace24a2e8ddbc9bf7b974b168110889f13a0a76aac2383f' 
  AND token = 'ivqeugdPGIn6LtBcyaaWEMqvCU49V5w4a0c7FDbg8jM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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