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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '160591b68487a5404d70905b49170dd840db01d0bd868fdd503c5ccf6c30b141' 
  AND token = 'k/R5/s3soPTw2KFWbqrSQKbTk3EN2+JByB/Sazrlwjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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