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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82d8daacc7f2f944481b3f983e855e80d91b65b0090c45c7d084f42bb7400978' 
  AND token = 'q06mPi7PnNsX10gRPmBjxXt6FPiYdsfydGHIFc2hmgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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