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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0a5c439ce64a5303f19022c9fe7088b7df97eca4add2a8d29cb4f4255abf7ab' 
  AND token = 'Z/P2E3tnWbRDU60kAqRB6yyT/A3MscoSiZa2LuJ4gYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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