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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c3acf7e3f1c88a97dbbe7635869b7ae17ad93f8a83f1ce1c0ae86b063f11983' 
  AND token = 'VbKFW0Hl5qTO6uJxJ/1AcpOUEWUhainxl9SQFQ8ugEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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