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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de3d16afbeb58f79af8b92a06512b38beb83283a098dc879c928bb8bd8ed2944' 
  AND token = 'qZ39VSRCjaGazchU08hUKUT7kAea7Cfdl4nXFJE+LjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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